Earth and the Moon

Neutrinos

What is a neutrino?

A neutrino is a tiny subatomic particle that is far smaller than an atomic nucleus; it has no electrical charge and a tiny mass. (Electrons are many thousands of times more massive than neutrinos, and protons and neutrons are many millions of times more massive.) Neutrinos are so tiny and ghostly that they almost always pass through any substance in the universe without any interference or reaction.